First of all I apologise if this is a silly question but I have been unable to work out how to do this in Blender and was wondering if anyone can help.

I am making a model of a train and would like to make the window frames rounded at the edges as they are in real life. I have been unable to work out how to do this with the Bevel function in Blender 2.77. Is there a simple way to make these windows with rounded edges instead of square ones?

an example of one of the corners I want to make rounded

Second image showing the wider context of the model and how the windows are formed from separate shapes Any help would be gratefully received.


  • $\begingroup$ Why don't you create a new frame inside of this window that has rounded edges? That way, with one piece, you can round all 4 corners at once. $\endgroup$ – user3685285 Apr 24 '17 at 19:48
  • $\begingroup$ Could you provide a Blend file so we can see some more context? $\endgroup$ – CGEffex Apr 24 '17 at 19:55
  • $\begingroup$ I had considered creating a new frame inside of the window but was unsure as to how I would create the curved edges required. $\endgroup$ – Stephen Apr 24 '17 at 20:08
  • $\begingroup$ I am not sure how to upload a blend file. Let me see what I can do. PS - Thanks for your comments so far. $\endgroup$ – Stephen Apr 24 '17 at 20:10
  • $\begingroup$ Use blend-exchange.giantcowfilms.com to upload the blend file and add it to your post. $\endgroup$ – CGEffex Apr 24 '17 at 20:23

Usually in Blender, there are two ways one would round the corner of a window, the edges of which are made from more than one object. One is to make the window a separate object from both of the other two; the other is to combine the objects surrounding the window into a single object, perhaps while leaving the individual meshes separate.

Tools and techniques one would ordinarily use in rounding a corner do not work in Blender across multiple objects.


The best option would be to make the whole window surround from one mesh. This would allow you to bevel each corner.

You can add extra geometry, create the bevel and remove the extra to get the result you are after.

bevel and trim


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